Okay, I googled the R-672 and found a brief description from the CES show that stated it had "HDMI switching only". Assuming that's correct, then as I stated, you'll have to use a separate cable for audio(except directly to the TV). Again though, study your manual and someplace(buried?)in the hookup instructions there should be an indication that when you use the HDMI cable for video you'll have to also attach a separate cable for audio.

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Enjoy the music, not the equipment.